Xiao-Cong Zhou1, Yi Jiang2. 1. Department of Surgery, The Dingli Clinical Institute of Wenzhou Medical University (Wenzhou Central Hospital), Wenzhou, Zhejiang, P.R. China. 2. Department of Pathology, The Dingli Clinical Institute of Wenzhou Medical University (Wenzhou Central Hospital), Wenzhou, Zhejiang, P.R. China.